In China, Tibet and the Himalayas Goji berries have been used as traditional food for hundreds of years. They are small bright orange-red fleshy berries, sold in a dried form in many Chinese grocery stores. They are used in many Chinese soups, sweet teas and tonic drinks.

At present there are too many brands of Goji juice on the market. Are they scientifically formulated? People can even find packs of dried goji berries adorning the aisles in some large Supermarkets. A better understanding of Total Antioxidant Capacity (TAC) on Goji products may help consumers in choosing the best product they should buy. The TAC score tells us that a given amount of the tested product has the same radical scavenging capacity as a known amount of a water-soluble form of vitamin E, to which the assay is standardised. Its score enables consumers to compare different Goji products. Most of the Goji products available on the Australian market do not provide any information on TAC.